J-4 - Delivery Order 1 - Argon Distribution VJ Pipes Valves SOW (2) (1).pdf

Long-Baseline Neutrino Facility (LBNF) / Deep Underground Neutrino Experiment (DUNE) - US

LBNF/DUNE-US

Argon Distribution VJ Pipes & Valves Scope of Work and Performance Specification

Document Number: EDMS 3043356

Mark Adamowski Lead Cryogenics System Engineer

Roza Doubnik Cryogenics Systems Engineer

Matt Maciazka Cryogenics System Engineer

David Montanari LBNF FDC Deputy Project Manager for Cryogenics https://edms.cern.ch/document/2810641/LAST_RELEASED

Argon Distribution VJ Pipes & Valves Scope of Work and Performance Specification

Long-Baseline Neutrino Facility (LBNF) / Deep Underground Neutrino Experiment (DUNE) - US Page ii

Document Approvals

Signatures Required Date

Originator: Matt Maciazka Cryogenics Systems Engineer

Approver: Jolie Macier LBNF FDC Project Manager

Approver: David Montanari LBNF FDC Deputy Project Manager for Cryogenics

Approver: Mark Adamowski Lead Cryogenics Systems Engineer

Long-Baseline Neutrino Facility (LBNF) / Deep Underground Neutrino Experiment (DUNE) - US Page iii

Revision History and Version Control

This version of the document may not be the current or approved revision. The current revision is maintained in the LBNF/DUNE Document Management System (DocDB) or the Engineering & Equipment Data Management Service (EDMS) where internal Project document approvals are managed. DocDB can be accessed through the web by authorized users (https://docs.dunescience.org/), and EDMS can be accessed through the web at https://edms.cern.ch. This document can be identified by the revision date as indicated in the Version Control Table below.

The current, approved version is always available in DocDB or EDMS.

Author Revision Date Location (EDMS) Description of Changes

Matt Maciazka 02/19/24 3043356 v.1 Original – based on the EDMS 2810641 v.3

Matt Maciazka 03/07/24 3043356 v.2 Added the GN2 piping from the scope.

Matt Maciazka 03/12/24 3043356 v.3 Deleted acquisition division into Base Scope and Option #1.

https://docs.dunescience.org/_ https://edms.cern.ch/ https://edms.cern.ch/document/3043356/1 https://edms.cern.ch/document/2810641/3 https://edms.cern.ch/document/3043356/2 https://edms.cern.ch/document/3043356/3

Long-Baseline Neutrino Facility (LBNF) / Deep Underground Neutrino Experiment (DUNE) - US Page iv

Table of Contents

Document Approvals .................................................................................................................................... ii

Revision History and Version Control .......................................................................................................... iii

List of Figures .............................................................................................................................................. vii

List of Tables .............................................................................................................................................. viii

Acronyms and Abbreviations ....................................................................................................................... ix

1 Scope of the Document ................................................................................................................. 1-1

2 Terms Used in the Document ........................................................................................................ 2-1

3 Applicable Codes and Standards .................................................................................................... 3-1

4 Introduction ................................................................................................................................... 4-3

5 Scope of the Supply........................................................................................................................ 5-3

5.1 Scope of the Supply Structure ................................................................................................... 5-4

5.2 Additional Requirements for the Scope ..................................................................................... 5-4

6 General Description ....................................................................................................................... 6-5

6.1 Modes of Operation ................................................................................................................... 6-6

7 Functional Requirements ............................................................................................................... 7-7

7.1 Mechanical ................................................................................................................................. 7-7

7.2 Flexible Elements in Pipes .......................................................................................................... 7-7

7.3 Thermal Isolation ....................................................................................................................... 7-7

7.3.1 General Thermal Isolation Requirements .......................................................................... 7-7

7.3.2 Vacuum Brakes ................................................................................................................. 7-10

7.4 MLI Use .................................................................................................................................... 7-10

7.5 Leak Tightness .......................................................................................................................... 7-11

7.6 Specifications of Supplied Equipment ..................................................................................... 7-12

7.7 Pressure Relief Devices ............................................................................................................ 7-12

7.8 Vacuum Vessel Relief Devices .................................................................................................. 7-13

7.9 Temperature Sensors ............................................................................................................... 7-13

7.10 Pressure Sensors ...................................................................................................................... 7-14

7.11 Materials .................................................................................................................................. 7-14

Long-Baseline Neutrino Facility (LBNF) / Deep Underground Neutrino Experiment (DUNE) - US Page v

8 Interface Requirements ............................................................................................................... 8-15

8.1 General Interface Requirements ............................................................................................. 8-15

8.2 Vacuum Insulated Interface Requirements ............................................................................. 8-17

9 Manufacturing, Installation, and Assembly Requirements ......................................................... 9-20

9.1 Manufacturing ......................................................................................................................... 9-20

9.2 Labeling .................................................................................................................................... 9-20

9.3 Welding .................................................................................................................................... 9-20

9.4 Tube and Pipe Bending ............................................................................................................ 9-21

9.5 Cleaning .................................................................................................................................... 9-21

9.6 Installation ............................................................................................................................... 9-22

10 Shipping ...................................................................................................................................... 10-22

11 Examinations, Inspections, Tests ............................................................................................... 11-23

11.1 General ................................................................................................................................... 11-23

11.2 Non-Destructive Tests of Welds ............................................................................................ 11-25

11.3 Helium Leak Tightness Tests .................................................................................................. 11-26

11.3.1 General ........................................................................................................................... 11-26

11.3.2 From the Atmosphere to Insulation Vacuum ................................................................ 11-26

11.3.3 From Process Pipes to Insulation Vacuum ..................................................................... 11-26

11.4 Cold Test................................................................................................................................. 11-27

11.5 Pressure Test .......................................................................................................................... 11-27

11.6 Test of Rotating Equipment ................................................................................................... 11-28

11.7 Cleanliness Control ................................................................................................................ 11-28

11.8 Dimensional Control .............................................................................................................. 11-28

11.9 PLC Testing ............................................................................................................................. 11-28

11.10 Factory Acceptance ................................................................................................................ 11-28

11.11 Transport Accelerations ......................................................................................................... 11-29

11.12 Factory Outlet Inspection ...................................................................................................... 11-29

11.13 FRA Incoming Inspection (at SURF) ........................................................................................ 11-29

11.14 Final Position Inspection ........................................................................................................ 11-30

11.15 Positioning and Layout Control .............................................................................................. 11-30

Long-Baseline Neutrino Facility (LBNF) / Deep Underground Neutrino Experiment (DUNE) - US Page vi

11.16 Interfaces Control .................................................................................................................. 11-30

11.17 Hydraulic Continuity Control.................................................................................................. 11-30

11.18 Control of External Supports .................................................................................................. 11-30

11.19 Final Acceptance of the Argon Distribution VJ Pipes and Valves ........................................... 11-31

12 Deliverables for the Kick-Off Meeting........................................................................................ 12-31

13 Deliverables for the Engineering Phase ..................................................................................... 13-31

14 Deliverables for the Argon Distribution VJ Pipes and Valves Manufacturing ............................ 14-33

15 Deliverables for the Argon Distribution VJ Pipes and Valves Installation and Testing .............. 15-33

16 Quality Assurance ...................................................................................................................... 16-34

17 ES&H .......................................................................................................................................... 17-35

18 Project Management ................................................................................................................. 18-35

19 Documentation Management.................................................................................................... 19-37

Appendix A – Weight and Dimensions Limit for Transport ..................................................................... 19-1

Appendix B – LBNF Isometric Drawings and 3D model of LBNF Argon Distribution VJ Pipes and Valves . 19-

Appendix C – Argon Distribution Piping Interfaces .................................................................................. 19-1

Long-Baseline Neutrino Facility (LBNF) / Deep Underground Neutrino Experiment (DUNE) - US Page vii

List of Figures

Figure 6-1: Simplified flow schematic for LBNF cryogenics with part of the supply boxed in red ............ 6-5 Figure 8-1: Top View of the LBNF cryogenics systems layout .................................................................. 8-16 Figure 8-2: Field joint basic geometry ...................................................................................................... 8-18 Figure 8-3: Vacuum break labyrinth connection basic geometry ............................................................ 8-19 Figure 8-4: Continuous vacuum labyrinth connection basic geometry ................................................... 8-20

Long-Baseline Neutrino Facility (LBNF) / Deep Underground Neutrino Experiment (DUNE) - US Page viii

List of Tables

Table 6-1: Argon Distribution Modes of Operation ................................................................................... 6-6 Table 7-1: Maximum allowable heat leaks for cryogenic vacuum insulated pipes ................................... 7-8 Table 7-2: Vacuum levels in an insulation vacuum jacket (vacuum jacket) ............................................... 7-9 Table 7-3: Vacuum vessel pressure range ................................................................................................. 7-9 Table 7-4: Maximum acceptable helium leak rates ................................................................................. 7-11 Table 8-2: The environmental conditions for SURF CUC and Detector Caverns ..................................... 8-17 Table 11-1: Minimum control point for manufacturing and installation of the supply ........................ 11-24

Long-Baseline Neutrino Facility (LBNF) / Deep Underground Neutrino Experiment (DUNE) - US Page ix

Acronyms and Abbreviations

Acronym Definition

AACEI AACE International (Formerly the Association for the Advancement of Cost Engineering)

ACI American Concrete Institute

ANSI American National Standards Institute

APA Anode Plane Assembly

API American Petroleum Institute

ASCE American Society of Civil Engineers

ASME American Society of Mechanical Engineers

ASTM American Society for Testing and Materials

AUP Authorization for Use and Possession

BPVC Boiler and Pressure Vessel Code (ASME)

CAD Computer-Aided Design

CGA Compressed Gas Association

CFR Code of Federal Regulation

CUC Central Utility Cavern

DOE Department of Energy

DUNE Deep Underground Neutrino Experiment

DXF Data Exchange Format

EJMA Expansion Joint Manufacturers Association

EN European Norm

ES&H Environment Safety & Health

ESH Environment Safety and Health

EVMS Earn Value Management System

FAT Factory Acceptance Tests

FD-1 Far Detector 1

FD-2 Far Detector 2

FDC Far Detectors & Cryogenics

Long-Baseline Neutrino Facility (LBNF) / Deep Underground Neutrino Experiment (DUNE) - US Page x

Acronym Definition

FDR Final Design Review

FEA Finite Element Analysis

FEED Front-End Engineering Design

FMEA Failure Mode and Effect Analysis

FRA Fermi Research Alliance LLC

FSCF Far Site Conventional Facilities

FSF Far Site Facilities

GAr Gaseous Argon

GAN Gaseous Nitrogen

GC General Contractor

GN2 Gaseous Nitrogen

HAZOP Hazard and Operability Analysis

HP Hold Point

IC Installation Coordinator

IEC International Electric Code

IEEE Institute of Electrical and Electronics Engineers

IKC In-Kind Contribution

IRR Installation Readiness Review

ISA International Society of Automation

ISO International Standards Organization

LAr Liquid Argon

LBNF Long-Baseline Neutrino Facility

LBNF/DUNE-

US

Long-Baseline Neutrino Facility/Deep Underground Neutrino Experiment-United States

– Refers to the US DOE line-item project

LIN Liquid Nitrogen

LN2 Liquid Nitrogen

MIP Manufacturing and Inspection Plan

MLI Multi-Layer Insulation

MS Microsoft

Long-Baseline Neutrino Facility (LBNF) / Deep Underground Neutrino Experiment (DUNE) - US Page xi

Acronym Definition

MTBF Mean Time Between Failures

MTTF Mean Time to Failure

MTTR Mean Time to Repair

NB National Board of Boiler and Pressure Vessels Inspectors

NEC National Electric Code

NEMA National Electrical Manufacturers Association

NET No-Earlier-Than

NFPA National Fire Protection Association

NIST National Institute for Standards and Technology

NLT No-Later-Than

NP Notification Point

NTP Notice To Proceed

NWD Navisworks Document

OEM Original Equipment Manufacturer

OSHA Occupational Safety and Health Administration

PDF Portable Data Format

PDR Preliminary Design Review

PED Pressure Equipment Directive

PFD Process Flow Diagram

PLC Programmable Logic Controller

PRR Production Readiness Review

P&ID Piping and Instrumentation Diagram

QA Quality Assurance

QC Quality Control

QM Quality Manual

RFP Request for Proposals

SCADA Supervisory Control and Data Acquisition

SDSTA South Dakota Science and Technology Authority

Long-Baseline Neutrino Facility (LBNF) / Deep Underground Neutrino Experiment (DUNE) - US Page xii

Acronym Definition

SLD Single Line Diagram

SLIN Subcontract Line Item Number

SOW Statement of Work

SPVD Simple Pressure Vessel Directive

STEP Standard for the Exchange of Product Data

SURF Sanford Underground Research Facility

T&C Terms and Conditions

UL Underwriters Laboratories

V&I Valves and Instruments

VIP Vacuum Insulated Pipe

VJ Vacuum-Jacketed

Scope of Work and Performance Specification Scope of the Document

Long-Baseline Neutrino Facility (LBNF) / Deep Underground Neutrino Experiment (DUNE) - US 3-1

1 Scope of the Document This document defines the Scope of Work for the Argon Distribution VJ Pipes and Valves for the Long- Baseline Neutrino Facility (LBNF). Exceptions to these specifications shall not be permitted, except by written approval from FRA.

2 Terms Used in the Document The following terms define provisions within this document. “May” indicates a condition is neither required nor prohibited. “Should” indicates a recommended provision as good practice but is not a requirement. “Shall” indicates a requirement.

Engineering and Construction Codes will be referred to as Codes to refer collectively to various safety standards the scope shall comply with. This will be reflective of both American and International Codes, depending on the applicable Code used by the Subcontractor’s governing body.

3 Applicable Codes and Standards Below are codes, standards, and directives to which the Subcontractor shall adhere, and which shall be applied to the engineering, manufacturing, assembly, and testing of the system subject to this Statement of Work (SOW). All the codes, standards, and directives are intended to be used in their latest published edition at the time of engineering, and include, but are not limited to:

• ACI 318 Building Code Requirements for Structural Concrete and Commentary

• ALPEMA standards

• ANSI ASC A14.3 Safety Requirements for Fixed Ladders

• ANSI/ASSE A1264.1 Safety Requirements for Workplace Surfaces

• ANSI/ISA-5.1 Instrumentation Symbols and Identification

• ANSI/ISA-75.01.01 Flow Equations for Sizing Control Valves

• ANSI/NEMA IM 60000-2021 Industrial Laminated Thermosetting Products

• API 520 Sizing, Selection, and Installation of Pressure-reliving Devices

• API 521 Pressure-relieving and Depressuring Systems

• API 526 Flanged Steel Pressure-relief Valves

• API RP 615 Valve Selection Guide

• ASCE/SEI 7 Minimum Design Loads for Buildings & Other Structures

• ASME B30.20 Below-the-Hook Lifting Devices

• ASME B30.26 Rigging Hardware

• ASME B30.9 Slings

• ASME B31.3 Process Piping

• ASME B31E Standard for the Seismic Design and Retrofit of Above-Ground Piping Systems

• ASME BPVC Boiler and Pressure Vessel Code

Scope of Work and Performance Specification Applicable Codes and Standards

Long-Baseline Neutrino Facility (LBNF) / Deep Underground Neutrino Experiment (DUNE) - US 3-2

• ASME BTH-1 Design of Below-the-Hook Lifting Devices

• ASME Y14.100 Engineering Drawing Practices

• ASME Y14.5M Dimensioning Tolerance Code

• ASTM E2734/E2734M Standard Specification for Dimensions of Knife-Edge Flanges

• ASTM A380 Standard Practice for Cleaning, Descaling, and Passivation of Stainless-Steel Parts, Equipment, and Systems

• ASTM E493 Standard Test Methods for Leaks Using the Mass Spectrometer Leak Detector in the Inside-Out Testing Mode

• ASTM E498 Standard Test Methods for Leaks Using the Mass Spectrometer Leak Detector or

Residual Gas Analyzer in the Tracer Probe Mode

• ASTM E499 Standard Test Methods for Leaks Using the Mass Spectrometer Leak Detector in the Detector Probe Mode

• CGA S-1.3 Pressure Relief Standards

• CGA G-4.1 Cleaning Equipment for Oxygen Service, Seventh Edition

• EN 12300 Cryogenic vessels. Cleanliness for cryogenic service

• EN 60534-2 Industrial Process Control Valves

• EN 61508 Functional safety of electrical/electronic/ programmable electronic safety-related systems

• EJMA standards

• IEC 61511 Functional safety - Safety instrumented systems for the process industry sector

• IEEE 315 Graphics Symbols for Electrical and Electronics Diagrams (Including Reference

Designation Letters)

• ISA-75.01.01 Industrial-Process Control Valves

• ISA 84.00.01 Functional Safety: Safety Instrumented Systems for the Process Industry Sector

• ISA-S20 Specification Forms for Process Measurement and Control Instruments, Primary

Elements, and Control Valves

• ISA-S5.4 Instrument Loop Diagrams

• ISO 23208 Cryogenic vessels - Cleanliness for cryogenic service

• ISO 28921-1 Industrial valves. Isolating valves for low-temperature applications - Design, manufacturing, and production testing

• ISO 3669 Vacuum technology. Dimensions of knife-edge flanges

• NFPA 70E National Electric Code (NEC)

• OSHA Standard 1910 General Industry Regulation

• OSHA Standard 1926 Safety and Health Regulations for Construction

• UL 471 Commercial Refrigerators and Freezers

• UL 61010-2-011 Safety Requirements for Electrical Equipment for Measurement, Control, and

Laboratory Use - Part 2-011: Particular Requirements for Refrigerating Equipment

Scope of Work and Performance Specification Introduction

Long-Baseline Neutrino Facility (LBNF) / Deep Underground Neutrino Experiment (DUNE) - US 5-3

• UL 508A Industrial Control Panels

The Subcontractor may propose other recognized standards. Their application is subject to prior written approval by Fermi Research Alliance (FRA). In such cases, the Subcontractor shall submit all the necessary documentation for approval to FRA. FRA, at its discretion, reserves the right to veto the use of certain codes or standards, in part or whole. In no event will FRA be responsible for schedule delays or cost increases associated with the review and evaluation of alternative codes or standards proposed by the Subcontractor.

The International Electric Code (IEC) may be used if supporting documentation is provided to prove an equivalent or greater level of safety to that afforded by NFPA 70E NEC. The use of IEC shall be approved by FRA.

4 Introduction LBNF (http:/lbnf-dune.fnal.gov/) will provide the infrastructure necessary to support the massive neutrino detectors located deep underground at the Sanford Underground Research Facility (SURF) in Lead, SD. The Deep Underground Neutrino Experiment (DUNE) will employ four (4) such detectors, housed in cryostats requiring almost 70,000 tons of liquid argon (LAr), about 17,500 tons for each cryostat. DUNE (http://www.dunescience.org/) is expected to achieve transformative discoveries, making definitive determinations of neutrino properties, examining the dynamics of supernovae that produced the heavy elements necessary for life, and probing the possibility of proton decay.

5 Scope of the Supply The Argon Distribution VJ Pipes & Valves (hereafter referred to, in whole or in part, as “the supply”) serves to transfer gaseous and liquid argon throughout the underground portion of LBNF, housed 4850 ft (1478 m) below the surface level of the Sanford Underground Research Facility (SURF). The supply therefore connects the various other argon subsystems at LBNF for the ultimate purpose of building and maintaining a clean reservoir of LAr within the LBNF cryostats. The supply also includes some piping used to transport liquid nitrogen. A simplified Process Flow Diagram for the LBNF cryogenics is shown in Figure 6-1.

The successful bidder (hereafter referred to as the “Subcontractor”) shall engineer, manufacture, pack, deliver, install, and perform the acceptance tests at SURF for the Argon Distribution VJ Pipes & Valves .

The Subcontractor shall furnish all labor, professional engineering services, equipment, and materials to deliver the supply in accordance with the requirements of this SOW to SURF in the vicinity of Lead, South Dakota, install it underground at SURF and perform acceptance tests.

The supply includes myriad of vacuum jacketed (Insulated) piping, with associated valves, instrumentation, and all required support structures.

http://lbnf-dune.fnal.gov/ http://www.dunescience.org/

Scope of Work and Performance Specification Scope of the Supply

Long-Baseline Neutrino Facility (LBNF) / Deep Underground Neutrino Experiment (DUNE) - US 5-4

5.1 Scope of the Supply Structure

The Argon Distribution VJ Pipes and Valves acquisition includes:

• The detailed engineering of the whole system, consisting of the Vacuum Jacketed Piping with associated valves, instrumentation, and required support structures.

• The development of a schedule plan for the installation and testing of the supply, as well as all material, equipment, documentation, and labor necessary to perform the work in accordance with contractual requirements to meet the defined schedule.

• The procurement of materials and manufacturing of the Vacuum Jacketed Piping and associated valves, instrumentation, and support structures.

• The testing of the fabricated items per applicable codes and standards and in accordance with the specifications, the delivery of equipment to SURF, its installation and final testing.

• Management, ESH and QA/QC oversight, and the administration of all subcontracts necessary to deliver the supply.

This scope shall be inclusive of all material, equipment, labor, etc., necessary to perform the work in accordance with contractual requirements to meet the defined schedule.

5.2 Additional Requirements for the Scope

Additional requirements for the scope are outlined below:

1. The Subcontractor shall furnish all facilities, equipment, special tooling, consumables, materials, and labor for the work described in this SOW except where explicitly excluded in this and related documentation.

2. The Subcontractor shall provide all materials and labor for engineering, analysis, manufacturing, validation, delivery, installation and final testing of the supply.

3. The Subcontractor shall perform stress and thermal analyses for the supply to verify the code and performance requirements.

4. The Subcontractor shall provide the complete technical documentation for the supply, including individual technical items and elements.

5. All engineering analyses, engineering models, and manufacturing drawings shall be subject to approval by FRA.

6. The Subcontractor shall furnish spare parts for the supply for 2-year operation, if any, as well as a list of recommended spare items. Additionally, the Subcontractor shall also guarantee the availability of spare parts for ten (10) years thereafter.

7. The Subcontractor shall include the connections for the piping at each interface point.

8. The Subcontractor shall conduct all tests, inspections, examinations, material tests, and non-destructive examinations required by the applicable codes and perform any resulting repairs or replacements.

Scope of Work and Performance Specification General Description

Long-Baseline Neutrino Facility (LBNF) / Deep Underground Neutrino Experiment (DUNE) - US 6-5

9. The Subcontractor shall furnish all parts deemed necessary during the installation process, including spare parts for non-reusable items.

10. The Subcontractor shall respect the logistics constraints to transport the equipment to the 4850L. See Appendix A.

11. FRA (or its designated representative agent) reserves the right to witness and inspect any part during the fabrication, assembly, and testing at the Subcontractor or Subcontractor’s suppliers / sub-Subcontractors site with as little as one day’s notice.

6 General Description The Argon Distribution VJ Pipes and Valves is responsible for transferring the cold gaseous argon, liquid argon, and gaseous and liquid nitrogen for regeneration underground at SURF for LBNF, in order to build and maintain a stable, pure supply of LAr for the LBNF cryostats. A simple flow schematic for the LBNF cryogenics subsystems is shown in Figure 6-1; the supply includes all of the vacuum insulated argon piping underground within the CUC, the drifts between the CUC and the Detector Caverns, and within the Detector Caverns themselves.

Figure 6-1: Simplified flow schematic for LBNF cryogenics with part of the supply boxed in red

Isometric views of the pipe layouts are available in Appendix B. These layouts include the expected pipe envelopes; the Subcontractor shall not exceed these without written approval by FRA.

Scope of Work and Performance Specification General Description

Long-Baseline Neutrino Facility (LBNF) / Deep Underground Neutrino Experiment (DUNE) - US 6-6

6.1 Modes of Operation

The supply serves to distribute GAr and LAr throughout the underground for myriad purposes, exchanging argon from the various cryogenic subsystems in order to fill the LBNF cryostats with LAr and maintain their reservoir throughout the thirty-year expected lifetime of the DUNE experiment. It is also used for GN@ and LN2 transfer in limited capacity (for regeneration only). The supply’s modes of operation therefore mirror those of the underground facility and can be defined as described in Table 6-1.

Table 6-1: Argon Distribution Modes of Operation

Mode Name Description

1 LAr Return LAr from the condensers and LAr pumped directly from the cryostats are transferred back into the CUC where the bulk is purified in the LAr Filtration skids.

2 LAr Supply Purified LAr from the CUC is directed back to the Detector Caverns where it is temporarily stored in LAr Phase Separators and then sent to the cryostats.

3 GAr Return Boil-off gas from the cryostats is collected in individual headers (one above each cryostat) and returned to their respective condenser units.

Filter Regeneration

A small amount of LAr is drawn from the LAr supply periodically to regenerate the Purification vessels. The supply serves to transfer a hot (500 K) 97.5/2.5% GAr/H2 mix to regenerate the filters as well as pure, cold GAr to cool them back to their normal operating temperature.

5 LN2 Supply

The supply serves to bridge the gap between the LN2 system (a separate acquisition) and the Filter Regeneration systems, all within the CUC. In this mode the supply delivers LN2 from the LN2 system to the Regeneration Systems.

6 GN2 Return

The return serves to bridge the gap between the LN2 system (a separate acquisition) and the Filter Regeneration systems, all within the CUC. In this mode the supply returns GN2 from the Regeneration Systems to the LN2 system.

Cryostat pressure control

Primary cryostat pressure control is provided by a condenser (outside of this scope). The scope provides additional control by employing boil-off control

Scope of Work and Performance Specification Functional Requirements

Long-Baseline Neutrino Facility (LBNF) / Deep Underground Neutrino Experiment (DUNE) - US 7-7

Mode Name Description valve, which maintains normal cryostat pressure (50 mbarg); it also limits the cryostat under pressure in the event of excess condenser power.

7 Functional Requirements

7.1 Mechanical

1. The supply shall be designed for an operational lifetime of 30 years.

2. All piping shall have adequate flexibility for all design conditions.

3. All piping shall be adequately supported for all design conditions.

4. Whenever possible, welded connections shall be used.

5. When gaskets are required, metal gaskets shall be used whenever possible.

7.2 Flexible Elements in Pipes

1. Flexible hoses and bellows may be used. However:

a) Bellows should pass a receiving leak test to ensure they are leak-tight before welding.

b) The Subcontractor shall provide a plan to protect the bare convolutions of the bellows during welding, testing, and transport.

c) Unbraided bellows are not allowed; all bellows must have at least a single braid for protection.

2. Multiple layered bellows shall be engineered to have a vent hole between each layer to prevent trapped volume gas from over pressurization.

3. The Subcontractor should limit the usage of bellows and flexible hoses, promoting the use of flexibility analysis where possible.

7.3 Thermal Isolation

7.3.1 General Thermal Isolation Requirements

Cryogenic pipes shall be vacuum insulated, in combination with aluminized mylar, Multi-Layer Insulation (MLI), with no active mechanical pumping. The maximum allowable heat load on the process pipe surface of every vacuum-insulated cryogenic pipe, due to radiation and conduction through the supports, shall be less than maximum allowable heat leak given in the Table 7-1. No ice shall be visible on the outside of the vacuum insulation while in normal operation (with the process pipe carrying cryogenic fluid).

Long-Baseline Neutrino Facility (LBNF) / Deep Underground Neutrino Experiment (DUNE) - US 7-8

Table 7-1: Maximum allowable heat leaks for cryogenic vacuum insulated pipes

Pipe size, inch Heat leak

Process pipe Vacuum Jacket Btu/hr/ft W/m

0.5 2 1.71 0.50

1 3 2.22 0.65

1.5 3.5 2.90 0.85

2 4 3.92 1.15

3 5 5.97 1.75

4 6 7.68 2.25

6 8 10.24 3.00

Whenever possible, and practical, vacuum insulation in combination with MLI with no active mechanical pumping shall be chosen for other cryogenic components (e.g., vessels) as well. The maximum allowable heat load in vessels and other components shall be minimized depending on the size of the component. The specific value of each component shall be approved by FRA during the design reviews.

The required vacuum levels in the insulation vacuum, also called vacuum jacket, are listed in Table 7-2.

The pumping ports shall be engineered to avoid the intake of any loose MLI. The installation of grids at the inlet of each pumping port is acceptable provided they do not compromise the pumping process by excessive pressure drop and that they are engineered to prevent blocking by MLI. Each vacuum space longer than 50 m (164 ft) shall be equipped with an InstuTech Stinger convection vacuum gauge, part number CVM211GGL. Other devices are subject to written FRA approval.

The design of the internal assemblies shall allow for proper conductance during pumping operations.

Conductance holes in the internal supports shall be foreseen whenever deemed necessary to allow evacuation of the complete internal volume to reach the specified insulation vacuum pressures.

The maximum pumping speed shall be determined for transfer lines to avoid deterioration of MLI, taking into account the internal conductance and expected outgassing rates of the different materials used for construction, in order to achieve the specified insulation vacuum pressures at room and cryogenic temperatures.

Long-Baseline Neutrino Facility (LBNF) / Deep Underground Neutrino Experiment (DUNE) - US 7-9

Table 7-2: Vacuum levels in an insulation vacuum jacket (vacuum jacket)

Scenario Vacuum level Vacuum level

Pa mbar

At room temperature with active pumping (after 100 hr of pumping)

< 5⋅10-1 < 5⋅10-3

At nominal temperature without active pumping

< 5⋅10-2 < 5⋅10-4

Where vacuum isolation is chosen, the vacuum space design pressure is listed in Table 7-3.

Table 7-3: Vacuum vessel pressure range

Pressure Maximum Pressure Minimum Pressure psia bara psia bara

Internal 21.8 1.5 0 0

External Atmospheric Atmospheric Atmospheric Atmospheric

The Subcontractor shall perform all the necessary calculations to verify that the overall stresses and loads remain within acceptable values (as defined in the chosen applicable standards).

The mechanical design of the vacuum jacket shall consider also the appropriate thermal load and displacement given by the cryogenic temperature.

Special attention shall be given to the case of “loss of insulation vacuum” where the temperature of the pipe/vessel decreases from ambient temperature. If expansion joints are used in the vacuum jacket, the contractor shall consider the capacity to withstand the specified design cases without mechanical failure or permanent deformations. The following requirements also apply:

• The vacuum insulation space shall be engineered for continuous sealed vacuum operation.

• Each vacuum vessel shall have a single large enough pump-out ports with an associated vacuum mechanical isolation valve; ACME’s CVI V-1046 shall be used for this purpose. Any tooling required to open the mechanical isolation valves shall be provided.

Long-Baseline Neutrino Facility (LBNF) / Deep Underground Neutrino Experiment (DUNE) - US 7-10

• Each vacuum vessel shall be supplied with vacuum relief valves and associated vacuum relief analysis.

• For shapes not specifically covered in the ASME BPVC code, the external pressure for buckling failure predicted by Finite Element Analysis (FEA) shall not be less than 3.5 times the maximum pressure differential.

• Weld configurations not specifically approved or prohibited by code may be used subject to FRA written approval.

• The vacuum vessel support structure and lifting lugs shall account for all forces, including but not limited to weight, vacuum load, and all dynamic loads that may occur as a result of an accidental loss of insulating vacuum and seismic events (lifting lugs may be excluded from the seismic case). The Subcontractor shall provide an engineering analysis of the vacuum vessel support structure and lifting lugs, including consideration of the center of gravity.

• There shall be no condensation of water on the vacuum jacket of any device under normal operation.

• Vacuum vessel access covers (heads or plates) shall be designed to allow for their full removal from any device. Access covers shall be provided with lifting lugs to support the access cover during installation or removal. Access covers shall allow easy access for the maintenance/repair of critical internal components.

• Any temporary vacuum equipment needed for the installation and/or testing of vacuum-insulated pipes and vessels shall be supplied by the Subcontractor as part of this SOW.

7.3.2 Vacuum Brakes

The use of vacuum breaks in the pipelines is permitted at the connections between the pipelines’ subsections (field joints). This creates internal vacuum insulated interfaces and shall therefore follow Section 8.2 of this document. The use of vacuum breaks in the supply is permitted for both pipeline types:

1. Long pipelines – these are the pipelines connecting packages between the Detector Caverns and the Central Utility Cavern.

2. Short pipelines – these are the pipelines connecting packages within either the Detector Caverns or the Central Utility Cavern.

Continuous vacuum field joints (Figure 8-4) may also be used.

7.4 MLI Use

MLI shall be protected from humidity and dust. The handling of MLI shall be done using powder-free white gloves to control cleanliness. The compression of the layers during the wrapping operation shall also be prevented. Storage of MLI, whenever applicable, shall be made in a room with controlled environment where the relative humidity shall not be higher than 55%. During manufacturing and

Long-Baseline Neutrino Facility (LBNF) / Deep Underground Neutrino Experiment (DUNE) - US 7-11 installation, the components on which the MLI has been wrapped, shall be periodically controlled (after each mechanical intervention) to check their cleanliness and to verify that the MLI has not been damaged.

It shall be ensured that the MLI is protected during welding operations to avoid damages and fire due to the presence of a heat source. The contractor shall make use of appropriate non-flammable protection material (characterized by minimal outgassing) installed over the MLI or shall foresee use of welded backing rings at the location where vacuum jacket welds will be performed.

MLI shall be fixed by means of appropriate fixation methods (e.g., using Mylar tape) and taking into account the internal movements occurring during temperature transients to prevent uncovering cold surfaces and degradation of MLI. The overlapping of MLI layers, whenever applicable, shall be made respecting the temperature gradient across MLI to prevent that layers at different temperatures are in contact with each other.

The Subcontractor shall guarantee that a dedicated procedure for MLI wrapping is established, implemented, and maintained for the manufacturing and installation phases to comply with the requirements described above.

For the intended vacuum pressure (Table 7-2) of 5×10−2 Pa (5×10−4 mbar), the heat flux through MLI layers shall not be higher than 0.3 Btu/hr/ft2 (1 W/m2) from 300 K to 77 K.

This value shall be considered for the choice of an appropriate MLI. The MLI wrapping around the process pipes shall not create a confined space preventing discharge and evacuation events. The MLI shall be installed in a manner such that it will not detach or degrade during evacuation operations.

7.5 Leak Tightness

The maximum leak rates at the maximum pressure differential for vacuum insulated components shall not exceed the values given in Table 7-4.

Table 7-4: Maximum acceptable helium leak rates

Description Maximum acceptable Helium leak rate

Pa⋅m3/s

Global leak rate from cryogenic process piping to insulating vacuum

10-9

Global leak rate from insulating vacuum to atmosphere 10-9

Long-Baseline Neutrino Facility (LBNF) / Deep Underground Neutrino Experiment (DUNE) - US 7-12

Description Maximum acceptable Helium leak rate

Pa⋅m3/s

Global leak rate to the insulation vacuum through vacuum barriers with a pressure difference of 1 bar at 300 K

10-9

Individual leak rate of a flanged assembly 10-9

Individual leak rate of helium across the valve seat at maximum allowable pressure and any operation temperature

10-5

7.6 Specifications of Supplied Equipment

1. All components shall be supplied by the Subcontractor along with associated specification sheets.

2. All process control valves shall be sized according to ANSI/ISA-75.01.01 Flow Equations for

Sizing Control Valves and shall provide for proper control for all modes of operations.

3. Cryogenic valves should be of sufficient length to reduce the head load and guarantee their functioning when at cryogenic temperature by meeting ISO 28921-1. The heat load shall not exceed 13.6 Btu/hr (4 W) per device.

4. All components shall have the manufacturer name and model number clearly and permanently marked for visual observation.

5. All components installation shall meet all original equipment manufacturer (OEM) installation requirements.

6. All control valves shall be leak tight across the seal and seat when closed according to the values listed in Table 7-4 section 7.5. Leak rates are measured at room temperatures and maximum working pressure.

7. All wire/cable shall be of type LSZH (low smoke zero halogen) unless fully contained within a metallic enclosure (conduit, fully enclosed cable tray, etc.).

7.7 Pressure Relief Devices

1. Pressure relief devices shall be provided and sized by the Subcontractor to meet the appropriate codes listed in section 3 of this document.

2. Reliefs shall be sized to relieve pressure in situation including but not limited to vacuum loss, trapped volume, rapid vaporization, etc.

3. The Subcontractor shall provide sizing calculation per applicable codes and documentation indicating the maker and model of each relief device for FRA approval.

Long-Baseline Neutrino Facility (LBNF) / Deep Underground Neutrino Experiment (DUNE) - US 7-13

4. Relief sizing and placement shall be discussed with FRA during the design reviews to ensure all relieving scenarios are considered before manufacturing and the procurement of relief valves can take place. The final selection is subject to written FRA approval.

5. The pressure shall be set in gauge pressure.

6. All valves shall be leak tight across the seal and seat when closed according to the values listed in Table 7-4 section 7.5. Leak rates are measured at room temperatures and maximum working pressure.

7.8 Vacuum Vessel Relief Devices

1. To protect vacuum jackets from pressurization beyond their rating, each device shall be equipped with safety relief device(s). Consideration shall be given to over-pressure from all possible sources, including release of gases or fluids (e.g., by accidental rupture of internal components). The Subcontractor shall provide an engineering analysis of the vacuum reliefs and sizing calculations according to the applicable codes.

2. Vacuum relief valve port(s) shall be engineered to prevent blockage by MLI during relief flow conditions, as well as sufficient flow path to the interior vacuum space through MLI.

7.9 Temperature Sensors

1. Temperature sensors shall be suitable for temperature measurement for the full range between the minimum and maximum design temperature of the circuit. The choice of sensors is subject to written FRA for approval.

2. Suitable temperature sensor mounting options include surface, well, and stream in-flow and are subject to written FRA approval.

3. The measurement accuracy of the measurement chain shall be ± 0.5 K for the full temperature range.

4. Each measuring point shall have two sensors—one primary and one secondary. All sensors shall be wired to the feedthrough connector and cabled to the terminal box/rack, which will be connected to the PLC. The feedthrough shall be clearly labeled showing each sensor’s unique identification number.

5. The Subcontractor shall supply all feedthrough connectors and all connector adapters.

6. Adequate strain relief for all temperature sensor leads shall be applied.

7. For an internal stream in-flow thermometry mounting option, the following additional considerations are required:

a) No low-temperature feedthroughs shall be used.

b) Temperature sensing conduits shall be spiraled upwards.

c) Pressure sensing points may be combined with temperature sensing points utilizing a single conduit.

Long-Baseline Neutrino Facility (LBNF) / Deep Underground Neutrino Experiment (DUNE) - US 7-14

d) There shall be no unintended contact between sensing lines and any component of the system.

e) To minimize conduction heat load of the conduits for thermometry wiring, the length of the tube containing the wires for each sensor shall be at least 3 ft 3 inch (1 meter) long.

8. All temperature sensors used shall be 100 Ohm, wired using a 4-wire technique and clearly detailed in a Subcontractor provided wiring diagram. Subcontractor shall conduct continuity tests for each wire at the following times: 1) On the bench prior to installation on piping. 2) After mounted to pipe 3) After pipe is welded in place 4) After any MLI installation. 5) After any intermittent testing 6) After final testing. Subcontractor to keep log of each wire and keep track of every step along the way detailed above (Steps 1-6). Wire pairs shall be installed in a manner that reduces the effect of electromagnetic interference between adjacent wires and external sources.

7.10 Pressure Sensors

1. Pressure sensing lines shall use a conduit to room temperature; no low temperature pressure sensors shall be used. If needed, the tube shall be properly shaped to avoid liquid in the sensing line.

2. To minimize conduction heat load of the conduits, the length of the tube containing the wires of each sensor shall be at least 3 ft 3 inch (1 meter) long.

3. The Subcontractor shall provide pressure transducers for connection to the external pressure sensing lines. The choice of sensors shall be submitted to FRA for approval.

4. Transducers shall have a 0.5 % accuracy over the full range or better.

5. Transducers shall have a long-term stability of 0.25 % in 1 year or better.

6. Transducers shall have a 24 VDC excitation, a 2-wire design and a 4-20 mA output.

7. Transducers shall have isolation and calibration/purge valves.

8. Transducers shall be stainless steel.

9. Insulating vacuum pressure transducers shall have a range of 10-2 to 105 Pa (10-7 to 1 bara) and shall be equipped with an isolation valve. Vacuum pressure transducers shall be equipped with digital output status for alarm condition. InstuTech Stinger convection vacuum gauge, part number CVM211GGL shall be used for insulating vacuum measurement. Alternate sensors may be proposed subject to FRA approval.

10. Any differential pressure transmitter shall be equipped with appropriate isolation, equalization manifold, and purge valves.

7.11 Materials

1. All materials used in the Argon Distribution VJ Pipes and Valves shall be new and engineered for the operating parameters.

Scope of Work and Performance Specification Interface Requirements

Long-Baseline Neutrino Facility (LBNF) / Deep Underground Neutrino Experiment (DUNE) - US 8-15

2. Milled steel components shall be protected against corrosion.

3. Any materials or components used in a pressure vessel shall meet all requirements of ASME

BPVC per section 3 of this document.

4. Any materials used in pressure containing piping shall conform to the piping code for appropriate fluid service category.

5. All fittings, bends, miters, laps, and branch connections shall conform to the piping code requirements for appropriate fluid service category.

6. Any flanges and blanks shall conform to the piping…